Science : Ch 11 – The Human Eye and the Colourful World

The bluish colour of water in deep sea is due to:

The absorption of light by a molecule depends on the

The red colour of the sun at the time of sunrise and sunset is because:

A student traces the path of a ray of light through a triangular glass prism for diferent values of angle of incidence. On analysing the ray diagrams, which one of the following conclusions is he likely to draw?

Power of a lens is the measure of the degree of

Arjun remarked that he has seen wavering of objects when seen through a stream of hot air rising above a tandoor or a fire. He said that the air just above the fire becomes hotter than the air further higher up. He further said that this wavering can also be seen in the earth’s atmosphere as the earth’s atmosphere is not evenly distributed ,Name two observations which can be explained by the above phenomenon.

Arpit remarked that he has seen wavering of objects when seen through a stream of hot air rising above a tandoor or a fire. He said that the air just above the fire becomes hotter than the air further higher up. He further said that this wavering can also be seen in the earth’s atmosphere as the earth’s atmosphere is not evenly distributed ,What is the total time diference on duration of day on earth?

What would have been the colour of sky if the earth had no atmosphere

Power of a lens is

Effect produced by scattering of light by the atmosphere.

Why is red used as the stopping light at traffic signals?

The sky appears black to an astronaut

When a person can see faraway objects but not nearby objects.

A concave lens of short focal length has greater

The sky appears black to an astronaut as there is no